Signal

Genre: Crime ,&nbsp; Mystery ,&nbsp; Sci-Fi &amp; Fantasy ,&nbsp; Drama
Country: South Korea
Director: Kim Eun-hee,&nbsp; Kim Won-suk
Cast: Lee Je-hoon,&nbsp; Kim Hye-soo,&nbsp; Cho Jin-woong

A Crime and Mystery series first aired in 2016, Signal has 2 seasons with 24 episodes and comes from South Korea. Episodes run about 1h 29m. Soap2Day lists it with Lee Je-hoon and Kim Hye-soo in the cast. It holds 8.2/10 from 209 votes.  Detectives from the present and a detective from the past communicate via walkie-talkie to solve a long-time unsolved case.